document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1130918>Question 1130918</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The worlds biggest  led screen is in a small mall in Bejing, China its length is ten meters more than eight times in width. the total screen area is a whooping 7,500 square meters  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #747539 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=747539\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the area of the screen is 7500 square meters.<BR>\n" );
document.write( "the length is 10 meters more than eight times its width.\r<BR>\n" );
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document.write( "let L = the length and W = the width.\r<BR>\n" );
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document.write( "the formula for area of the rectangle is L * W = the area.\r<BR>\n" );
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document.write( "since the area is 7500 square meters, the formula becomes L * W = 7500\r<BR>\n" );
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document.write( "since the length is 10 meters more than eight times the width, then:\r<BR>\n" );
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document.write( "L = 8 * W + 10\r<BR>\n" );
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document.write( "the formula for area of L * W = 7500 becomes:\r<BR>\n" );
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document.write( "(8 * W + 10) * W = 7500, after your replace L with its equivalent value of 8 * W + 10\r<BR>\n" );
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document.write( "simplify (8 * W + 10) * W = 7500 to get 8 * W^2 + 10 * W = 7500\r<BR>\n" );
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document.write( "subtract 7500 from both sides of the equation to get 8 * W^2 + 10 * W - 7500 = 0\r<BR>\n" );
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document.write( "factor this quadratic equation to get W = -31.25 or W = 30\r<BR>\n" );
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document.write( "W can't be negative, so W must be equal to 30.\r<BR>\n" );
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document.write( "L = 8 * W + 10, so L = 8 * 30 + 10 = 250.\r<BR>\n" );
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document.write( "the length of the screen is 250 meters and the width of the screen is 30 meters.\r<BR>\n" );
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document.write( "the area of the screen is 250 * 30 = 7500 square meters.\r<BR>\n" );
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document.write( "solution looks good.\r<BR>\n" );
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document.write( "you could have also simplified the quadratic equation before solving to get:\r<BR>\n" );
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document.write( "8 * W^2 + 10 * W - 7500 = 0 becomes 4 * W^2 + 5 * W - 3750 = 0.\r<BR>\n" );
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document.write( "the solution would have been the same.\r<BR>\n" );
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document.write( "the problem was solved using the quadratic formula.\r<BR>\n" );
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document.write( "the width was 30.\r<BR>\n" );
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document.write( "the length was 250, which is 8 * 30 + 10.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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